Machine for drilling holes in boiits



APPLICATION FILED MAR. 2. I918.

Patented Oct. 7, 1919.

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F K. LANDGRAF.

MACHINE FOR DRILLING HOLES IN sons.

APPLICATION FILED MAR. 2. 1918- I Patented Oct. 7,1919.

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I 5 I II I W IIIIIII III I I I I m I I I m 6 3 O II II HH IHHMI I I I I I I I I I I I III M m .I A 9 M I I J'NV 'ENTOR FREDERICK K. LANDGRAF, or rIrrsBURen, Pemsetvearg rss r fca 'r'o- Fumes? BOLT CGMPANY, or PITTSBURGH, rEitNs'YLvANI'A.

MACHINE FOR; DRiLLING- notes in B'oikrs'.

Specification of Letters Patent.

Patented Oct. 7, 1919'.

Application filed March 2, 191a. Serial No: 2203094;

To all whom it may concern:

Be it known that I, FREDERICK K. LANDGRAF, a citizen of the United States, and a resident of Pittsburgh, in' the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Machines for Drilling Holes in Bolts; and I do hereby declare the following to be a full, clear, and exact description of the invention, such' as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to an improvement in machines'for drilling holes in bolts or bars and more particularly for drilling tell-taleholes in boiler stay bolts, and it consists of a frame, mechanism for supporting and rotating the work to be dril-led,'and drill fixed against rotation and means for feeding the drill upwardly toward the work.

It further consists in a frame,-mechanism for supporting and rotating the work to be drilled, and a hydraulic ram for feeding the drill to the work.

It further consists in means for feeding. a fluid to the end of the drill-'for lubricating the same and forwashing out tliechips. V

It further consists in parts" and combina tions of parts as will be more fully explained and pointed out in the claims.

In the accompanyingdrawings, Figure I is a view in front elevation partly in section of my improved machine. Fig. 2 is a similar view in side elevation. Fig. 3 is'a View partly in section and partly in elevation of the upper part'of my drill. Fig. 4 is a similar view of the lower part,and F ig'. 5 is a v1ew'1n-sec 7 tion of the drill.

3 are parallel guides preferably cyl1ndr1-' cal in shape, and connected by the cross bars 4-5 and 6, the said guides and cross bars forming the frame of the" machine which latter is supported on a suit'able base" V A guide 3, by set screws,- not shown;

or by other Ineansnot shown.

Threaded intothe bottom crossbar 6, and

voir' through the three-Way valve 8 carried by the cross head 6'. Located within the cylinder 7 and projecting upwardly through a stufli-ng box 9 screwed into the upper face of the cross head,- is the rain 10. This race is Screwed or otherwise secured to'' the upper sidegof cross head 11 is the hollow coupling; block '13, has which is inserted and secured by soldering or otherwise, the single flute drill 14. This drillv has anoil passage eX- tending throughout its' length, and the cross head 11 has a passage connecting the upper end of the hollow ram 1 0* and the lower end of the drill, so that a portion of the oil which actu'ates' the rain passes up intoand through the drill for lubricating its upper cutting edge and also for washing out the chips; the pressure and fibw of the oil passing up through the drill being regulated bythe stop valve 15 in the cross head 11.

Crossbar 5 is rigidlysecuredat its ends to the guides 33' and is provided centrally with a bronze block '18 carrying the drill bushing 1-6 inwhich the upper end of the drill l dnormal ly rests when the cross'head 11 is in its lowest position, the lower end of the bushing being cou-nterboredas at'16 to porting plate 19 preferably secured to' the' This plate carries the receivingchamber 20, which embracest'he" lower end' of the bushing 16,: and which receives the waste oil and chips" asthe latter'fall frorlrthe drill: The cheniprovided ber 20 is provided with a spill pipe 21 adapted to discharge the oil and chips into a suitable receptacle placed to recelve the same.

2 is a crossheadlocated above cross bar 5, and mounted at its ends on the guides 3, the ends of the crosshead being split as shown, and provided with clamping screws 23' for clamping it solidly to the guides. Located centrally in the cross head 22 is the bronze bushing 23 in which the bolt driver 24 is mounted to rotate, the end thrust of the bolt and driver being taken up by the ball bearing 25 interposed between the lower headed end of the bolt driver and the adjacent parts of the bushing 23 and the cross head 22. The bolt driver 24 is provided at its lower end with the blade 26 which enters the driver slot in the head of bolt 17, and is threaded at its upper end into a coupling 27 secured to the lower end of the square shaft 28. This square shaft passes upwardly through a similarly shaped opening in the collar 29, which is threaded to or otherwise secured to the hollow shaft 30, which latter is mountedin the bushing 31 secured within the upper cross bar 4, and is provided above said cross bar with a collar 32, which with the collar 29 holds said hollow shaft against endwise movement. Square shaft 28 telescopes with hollow shaft 30 and the latter is preferably open at the top to permit the square shaft to project therefrom in the event the drill is working on an extra long bolt.

Pivotally secured to the ends of cross head 22 are the links 33 connected at their upper ends to the short ends of the bifurcated lever 34 pivoted at 35 to the cross bar 4, the links being provided with a series of holes 36 spaced at short intervals apart whereby it may be adjusted with relation to the lever 34 to accommodate bolts of any length within the limits of the machine.

Secured to the hollow shaft 80 above cross bar 4 is the friction cone 37, which with the belt pulley 38, which is recessed to receive 1 the cone, forms 'a friction clutch for the shaft drive.

30. The pulley .38 runs freely on the shaft 30, and is normally held down onto the cone 37 by the spring 39 interposed between the collar 40 on shaft 30, and the anti-friction bearing 41 against which the hub of the pulley' 38 bears. grooved to receive the pins 42 on lever 43, which is pivoted on bracket 44 secured to cross bar 4, and connected at its outer end to 'a treadle, not shown, by a suitable rod or pitman.

Bracket 44 also-carries the belt pulleys 45 (only one being shown) around which the belt passes to change the direction of the Located between cross bar'5 and cross head 'The 'hub of the pulley is 6, are the drill supports 46 which normally rest on the seats 47 formed on the vertical guides 3, and support the drill against lateral deflection at points intermediate its length and between the hydraulic lifting means and the bolt being drilled. As the cross head 11 ascends it engages the underside of the lower support 46 and lifts it, and if the upward movement be continued,

the upper support 46 will be engaged by the drill and checks the tendency of the drill V totwist and also prevents excessive leakage of oil..:' 7.

In the operation of the machine the bolt 17uto be drilled, after having been center drilled at its shank end, is placed head up on. the center bearing 16, the recess in the lower end of the bolt receiving the said center bearing. If necessary the cross head .22 is elevated by depressing the long end of lever 34, and the bolt moved to the center line of the machine after which the cross head 22 is lowered until the blade 26 of the driver rests within the driver slot in thebolt head. The cross head 22 is then clamped to the guides 3. 7

After the bolt has been placed in position rotary motion is imparted to thesquare shaft through the clutch and belt mechanism described, thus rotating the bolt 17 on the center bearing 16. Oil is now admitted under pressure to cylinder 7 and operates to lift the ram 10 and drill 14. The drill is guided and supported in its upward movement and after passing through the bore of the center bearing 16, which also supports I it, it enters the bolt and drills the tell-tale any length required. Part of the oil ,enter ing cylinder 7 passes up through the ram and bore in the drill and emerges at the point of thelatter, thus not only keeping the drill continuously lubricated, but also by its flow operating to wash out the chips,which, passpreviously ex- 1 ci-ent to release the bolt 17 which is then re-.

moved and another placed in position for drilling.

With this construction it will be seen that the drill, which is comparatively slender, is supported against lateral deflection or bending, at intervals throughout its length during the entire boring operation and is also supported adjacent the lower end of the bolt, by the key L8 against torsional or twisting stresses, so that the only part of the drill that is subjected to torsional stresses is the part above the key.

It is the intention to provide each machine with a series of units constructed as above described, but as they are alike it is unnecessary to illustrate more than a single unit.

It is evident that many slight changes might be resorted to in the relative arrangements of parts shown and described without departing from the spirit and scope of my invention. Hence I would have it understood that I do not Wish to confine myself to the exact construction and arrangement of parts shown and described, but,-

Having fully described my invention what I claim as new and desire to secure by Letters-Patent is:

1. In a drilling machine, the combination of work clamping means, means for rotating the work, a drill, hydraulic devices including a cylinder and ram for feeding the drill longitudinally toward the work, and means for feeding fluid from the hydraulic cylinder to the cutting edge of the drill for lubricating the latter.

2. In a machine for drilling, the combination of work holding means, a drill having a passage for oil through same, a hydraulic cylinder, and a ram within the cylinder and carrying the drill, the said ram having an oil passage through same communicating with the oil passage in the drill.

3. In a machine for drilling, the combination of a vertically arranged frame, work holding means carried by said frame, a longitudinally movable drill, means for feeding the drill toward the work and a brace or support for the drill slidably mounted on the frame above the drill carrier, whereby the drill carrier in its movement from below toward the work, engages the said brace or support and moves it with the drill.

4. In a machine for drilling, the combination of a vertically arranged frame, work holding means carried by said frame, a drill, means for feeding the drill longitudinally toward the work, means for preventing the drill from turning, and a brace or support slidably mounted on the frame above the drill carrier, whereby the drill carrier in its movement from below toward the work, engages the said brace or support and moves it with the drill.

5. In a machine for drilling, the combination of work holding means, means forrotatin-g the latter, a drill, and hydraulic means for moving the drill upwardly and also for supplying a lubricant to its cutting end.

6. In a machine for drilling bolts, the combination of a vertical frame, means for supporting and holding the bolt in vertical position, a vertical drill, means for laterally bracing the latter, the said bracing means adapted to be lifted as the drill rises, and means for moving the drill upwardly for drilling a hole lengthwise the bolt.

7. In a machine for drilling bolts, the combination of a vertical frame, means for supporting and holding a bolt in vertical position, a drill, movable braces supporting the latter against lateral deflection and adapted to be automatically lifted as the drill advances, and means for moving the drill toward the bolt for drilling a hole lengthwise the latter.

8. In a machine for drilling, the combination of work holding means, a drill having an oil passage extending throughout its length, a hydraulic cylinder, a ram Within the cylinder and connected with the drill, and means connecting the hydraulic cylinder and oil passage in the drill for feeding oil under pressure to the cutting edge of the drill.

9. In a machine for drilling, the combination of work holding means, means for rotating the same, a drill having a passage for oil, means for holding the drill against rotation, a hydraulic cylinder, a ram within the cylinder and connected with the drill for feeding the latter to the work, and means connecting the hydraulic cylinder and oil passage in the drill for supplying oil to the latter. 7

10. In a machine for drilling, the combination of work holding means, means for rotating the latter, a drill located below the holding means and movable upwardly toward the work, means for feeding the drill to the work, a Waste receiving chamber for supporting one end of the work and fixed with relation to the work and means intermediate the work and the chamber for discharging of the waste to the latter.

11. In a machine for drilling, the combination of work holding means, means for rotating the latter, a Waste receiving chamber fixed with relation to the work, a drill located below the holding means and mova'ble upwardly toward the Work, the said drill passing through the Waste receiving chamber, and means carried by a Wall of-said chamber for holding the drill against rotation.

12. The herein described drilling method, consisting in rotating the Work to be drilled, simultaneously feeding a tool longitudinally With relation to the Work under constant 10 fluid pressure'and simultaneously conducting oil from said source of fluid pressure to: the cutting end of the tool during the drilling operation.

In testimony whereof I have signed this specification in the presence of tWo subscribing Wi-tnesses. FREDERICK LAND'GRAF.

Witnesses: W. G. GIBSON, V

H. MJSGHAD'EL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

